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You can use Battle for Wesnoth art for free if you make your project open-source. Just an idea.

It's a good idea. I considered it a few months ago, to gain access to a collection of Lovecraftian images for backgrounds/spell depictions. I might go down this path, depending on how things work out. It would mean that I can't use Unity Asset store code, though, which I am currently using for graphs, so there would be advantages and disadvantages.

Another disadvantage is that most people will think that you "stole" Wesnoth when they see the assets. :) I know this from experience :)