So, I put some asteroids I found around the web (so, someone else owns those images), plus one from the stat card on the asteroid base from the supplement to make a 2D asteroid piece. It looks better than a blank base, but not as cool as the 2.5D asteroids. I would like to upload it for people who aren't so skilled with image editing. What's the general rule on this? (using web images, bits from WWG, uploading for free) Is it kosher or should I just keep it to myself?

I don't think you can link to them, especially since there is a product with asteroids:

Well, that's my question. I know that those existed in uncharted space. Is a flat 2D asteroid cluster too close to those to be uploaded? The supplement guide shows a 2D asteroid on the base. I'm not sure if it was removed and were were left with a star field to give more value to the ones from uncharted space.