With Adair's comment about highlighting season, a good companion would be something blooming. If you have a flowering quince in bloom in March, or a super miniature african violet, or singinnia. Some of the Masdevallia orchids are small. Your accent should be small, compared to the BRT. Ferns, a fern with finely divided fronds would be too similar to the divided foliage of the BRT, but a fern with wider leaves, or a hosta might work.
Even better, BRT imply "savana grasslands", a mixed planting with some grasses, and perhaps wild violet or mint or bugleweed, (Ajuga, Agastache, Mentha) or maybe one of the puccoon flowers, Lithospermum. Mix the wild flowers with the grasses.
Or just a tray with moss. Especially the closer the BRT is to shohin size, moss in a tray or small pot can stand in for grass, in terms of perspective.