Looking for a challenge

Not that my concepts are getting worse (lets face it, only very few people can woks on the same level as i am, for free, while working full time), but i think i am overusing certain themes and my own fan-made lore segments (dream realm, etc). So, i am looking for some fresh ideas, challenges, something new to work around. Any and all ideas will be considered, as i will be exploring possibilities of each individual idea. Some best ideas might end up as amazing concepts, other might not. If you have any interesting ideas, any suggestions, leave them in the comment section bellow.