Hey man, and this is coming from a fellow gfx artist. As much as I would love a new tileset, it will not lead to new things. You start with 'New Things' from ideas and then work your way down. At the moment the main problem is not the tileset. (while many do not like it) it Is important to focus on content and then eventually after the content is made begin to fix up gfx and bad looking objects.
Instead focus making graphics for new quest or features players can try.