Anyone know good options for creating curvy 2D terrain?

Hi, I want to create 2D terrain for a game that won't look so 'blocky'. I've tried using a few terrain generators in the assets store but none of them actually allow me to cut out specific parts of terrain (like if I want cave-like pockets in the terrain sides). I've been looking through the forums and assets store for hours but the closest I've found is this: link text

... it doesn't seem the tool exists any more since I can't find it in the assets store.

Would it makes sense to draw out the terrain in photoshop/gimp and then import it into unity and just makes edge colliders around that or would that just be terrible?

thanks in advance.