While I had it handy I wanted to post the current plant availability + price list. Scroll down to see images for some of these selections.
Ruellia Bluebell - taller, true species plant, bright blue flowers, prune to size - $3.50
Ruellia 'Chi Chi' Bluebell - grows to about 14", lavender flowers - $3.50
Ruellia 'Katie' Bluebell - dwarf plant only 8" tall, perfect for nano riparium setups - $3.50
Asclepias Mexican Milkweed "gold" - horticultural selection that with blooms golden-orange milkweed blossoms - $3.50
Cyperus Umbrella Sedge - a "dwarf" variety, but can grow rather tall (to 30") in time, use this plant to form a grassy background - $3.50
Avicennia germinans Black Mangrove - slow-growing tree for freshwater, brackish or marine riparium planting - $3 for FOUR propagules
Spathiphyllum Peace Lily - peace lily is one of the most versatile riparium plants and you can use it in many kinds of setups. The dark green foliage works very well as background riparium foliage for other plants. - $3.50
Phalaris 'Strawberries & Cream' - attractive grass with white and pink-striped foliage - $3.50
Alternanthera - real attractive burgundy red and easy to grow - $3 Pilea cadierei Aluminum Plant - strudy stems and silver-spotted leaves make this one of the most attractive and usefull of trellis raft plants - $3
Thanks for looking! Just let me know any questions you might have.
Spathiphyllum Peace Lily in riparium planter
Lysimachia 'Outback Sunset' in my 11.4G riparium
Ruellia - the two bushy plants to the right in this tank are 'Chi Chi' (center) and tall bluebell (right). Both of these also bloom with attractive lavender and blue flowers.