In a recent podcast , Glen O. Seibert gave some tips for creating a compact water garden in a container. Here are a few more popular plants for container water gardens.
Aquatic Plants
Uprights
Blue flag iris (Iris versicolor, Zones 3 to 9)
Canna (Canna spp., Zones 7 to 10)
Calla lily (Zantedeschia aethiopica, Zones 8 to 10)
Dwarf papyrus (Cyperus papyrus ‘Nanus’, Zones 7 to 11)
Arrowhead (Sagittaria latifolia, Zones 5 to 11)
Sweet flag (Acorus calamus, Zones 4 to 11)
Yellow flag (Iris pseudacorus, Zones 5 to 8)
Fillers
Marsh trefoil (Menyanthes trifoliata, Zones 3 to 7)
Water clover (Marsilea drummondii, Zones 9 to 11)
Water lettuce (Pistia stratiotes, Zones 9 to 11)
Water lily (Nymphaea spp., Zones 4 to 11 for hardy spp., 10 to 11 for tropical spp.; hardiness varies with cultivar)
Trailers
Golden moneywort (Lysimachia nummularia ‘Aurea’, Zones 4 to 8)
Loosestrife ‘Outback Sunset’ (Lysimachia congestiflora ‘Outback Sunset’, Zones 6 to 9)
Parrot feather (Myriophyllum aquaticum, Zones 6 to 11)
Water mint (Mentha aquatica, Zones 6 to 11)
Resources
Aquatic plants and planting supplies
http://www.pondpals.com/aquatic_plants/
http://www.liveaquaria.com/
Solar-powered pumps
http://www.siliconsolar.com/
http://www.drsfostersmith.com/