Admittedly struggling to find non-plastic and/or eco friendly bath toys for my daughter who is entering the world of bath time as a joyous occassion.
Here's what I've come across so far:
Green Toys makes their toys from recycled milk jugs and has a tug boat and stacker set that I thought sure funmakers due especially to the strong color combos available for the tug boat.
Green Sprouts is another green friendly company and they have organic cotton splash toys and puppets for the bath which helps us take one more step away from more plastic.
Rich Frog also has non-plastic tub options. The Tub Toss and Fishin' Game are both cute.
For more ideas see these and other links on the Resources page!