I've based my Daqan forces terrain around a swamp theme. I'm looking for any ideas of what I might be able to use to make decent faux-lily pads. Does anyone have any ideas?

Sounds like you should have waited for Mahkim!

If I were doing that theme, I'd probably make them out of green stuff. Probably not the easiest or cheapest, but that's all I've got.

I made some out of modeling clay and painted em green for my swamp/lake terrain.

Depending on the size you want paint some light card green then use a hole punch to make the pads.

I'm thinking a flat round circle of putty, with a wedge cut out of it.

Depending on what size you're after, you can get plastic mats used as decoration in fish tanks. I've seen some with lily pads and flowers, maybe some of them would be suitable for you?

Thanks for the feedback. Here's what I ended up with. The unit base is going to end up with more lily pads, ultimately. One disadvantage of thin clay is that it breaks easily, so most of what I made ended up in the trash. But enough survived that I have a successful proof-of-concept. I'm going to need at least one more batch to finish this guy. I'll also be adding scrub and grass as well, but need to get the stuff that goes in the center of the figure in place first.

And the final product. Which mostly hides the lily pads, but that was the original intent.