I was thinking for the baby a 5 gallon might work, and a fake rock water dish? As for colors, I've always been partial to greens and blues.

One thing I forgot to mention is the overall temperatures and humidity in my home. Summer I keep the thermostat at roughly 77F for the day and usually it can drop to 76 or 75 over night. Typically during the summer the humidity stay sat around 40 to 50%. During the winter on the other hand temps typically range in the low 80's, but the humidity bottoms out around 18% or lower. The reason behind it being so hot is my parents have kept amazon parrots for years, and we just sort of adapted to the temperatures they tend to fair well in for the seasons.