After being denied accessions from GRIN, I was able to track down various tomato relatives from online sources. Here what's growing right now, and at the end, stock I've not yet grown. While some of these don't offer much directly in the way of "decorative" traits, they may be helpful in getting genes from one species into domestic micro tomatoes acting as a bridge.
S. Sisymbriifolium - "Litchi tomato" - prickly relative that has thorns on the stem and foliage. Pretty white flowers with a large yellow anther cone, and exerted stigma. Supposedly with a cherry-like flavor to the fruits. Scientific literature suggests crossing this one with S. Lycopersicum is possible, but difficult, and may need to employ embryo rescue, which is currently above my pay grade. Attempts will be made, however. I have seen several references in searches as using this as a trap crop. In my garden, it certainly attracts the potato beetles. I just cleared them out yesterday and they've come back and laid more eggs (and hatched some!). Can also apparently be used as rootstock for good disease resistance and cold tolerance. Have two sources of this one.
S. Chmielewskii - LA1028. So far, looks very similar to a domestic tomato in growth/colors though so far it's not as foliage/sucker heavy. Should produce fuzzy pale yellow fruits, that are not edible.
S. Corneliomulleri - (who names these things?) looks somewhat similar to Chmielewskii above at this stage. None of these have had enough time in the ground to really get going, and were pretty nutrient starved by the time I could plant them. Fruits should be fuzzy and green.
S. Cheesmanii - Galapagos Major but could potentially have been crossed. This may be very similar to the "Galapagos" I grew last year that I had obtained from Shule at Tomato Junction. This one I'm growing this year was sourced from HR Seeds.
Galapagos Gold - Not much info on this one from the source (J&L Gardens), but should produce a oval/grape yellow tomato. Claims appears to be resistant to blight.
S. Peruvianum - (Jacob Lofthouse's selection) - not adjusting too well to my environment. Green/purple fruit.
S.Peruvianum - (HR Seeds' selection) - adjusting a bit better than LH's version. I have several more seeds of both of these, so will be trying them again. This selection should produce mostly pale green fruits.
Additional stock not grown:
S. Habrochaites - Possibly the "lowlands strain". Was not successful in germination thus far.
S. Habrochaites - Second source. From Ecuador
Sara Galapagos - From the Galapagos, but likely crossed with domestic at some point. Good disease resistance
S. Galapagense - Galapagos Minor Type 2 - non hairy type.
S. Pimpinellifolium - Golden currant. Orangish fruit color
S. Pimpinellifolium - Yellow fruit color
S. Pimpinellifolium - red fruit color
S. Pimpinellifolium - another red. "spoon tomato"
S. Pimpinellifolium - "white" fruit color (pale yellow)
S. Pimpinellifolium - "Everglades" wild tomato from Florida
S. Sisymbriifolium - "Litchi tomato" - prickly relative that has thorns on the stem and foliage. Pretty white flowers with a large yellow anther cone, and exerted stigma. Supposedly with a cherry-like flavor to the fruits. Scientific literature suggests crossing this one with S. Lycopersicum is possible, but difficult, and may need to employ embryo rescue, which is currently above my pay grade. Attempts will be made, however. I have seen several references in searches as using this as a trap crop. In my garden, it certainly attracts the potato beetles. I just cleared them out yesterday and they've come back and laid more eggs (and hatched some!). Can also apparently be used as rootstock for good disease resistance and cold tolerance. Have two sources of this one.
S. Chmielewskii - LA1028. So far, looks very similar to a domestic tomato in growth/colors though so far it's not as foliage/sucker heavy. Should produce fuzzy pale yellow fruits, that are not edible.
S. Corneliomulleri - (who names these things?) looks somewhat similar to Chmielewskii above at this stage. None of these have had enough time in the ground to really get going, and were pretty nutrient starved by the time I could plant them. Fruits should be fuzzy and green.
S. Cheesmanii - Galapagos Major but could potentially have been crossed. This may be very similar to the "Galapagos" I grew last year that I had obtained from Shule at Tomato Junction. This one I'm growing this year was sourced from HR Seeds.
Galapagos Gold - Not much info on this one from the source (J&L Gardens), but should produce a oval/grape yellow tomato. Claims appears to be resistant to blight.
S. Peruvianum - (Jacob Lofthouse's selection) - not adjusting too well to my environment. Green/purple fruit.
S.Peruvianum - (HR Seeds' selection) - adjusting a bit better than LH's version. I have several more seeds of both of these, so will be trying them again. This selection should produce mostly pale green fruits.
Additional stock not grown:
S. Habrochaites - Possibly the "lowlands strain". Was not successful in germination thus far.
S. Habrochaites - Second source. From Ecuador
Sara Galapagos - From the Galapagos, but likely crossed with domestic at some point. Good disease resistance
S. Galapagense - Galapagos Minor Type 2 - non hairy type.
S. Pimpinellifolium - Golden currant. Orangish fruit color
S. Pimpinellifolium - Yellow fruit color
S. Pimpinellifolium - red fruit color
S. Pimpinellifolium - another red. "spoon tomato"
S. Pimpinellifolium - "white" fruit color (pale yellow)
S. Pimpinellifolium - "Everglades" wild tomato from Florida