Several different varieties of red begonia- some standard, some very beautiful hybrids. Also search "Premium Begonia Rex" for more options.
These plants love humidity and part shade, and do AMAZINGLY in terrarium environments, but they also do well in the home- as long as they aren't allowed to dry out completely.
If you're making a terrarium, we can definitely help with that too. Check out our collection "Terrariums and Supplies", which we are building up now. We hope to soon have a regular 'Terrarium Creation Workshop' at the shop for those interested!