Well at the moment, i am actually tinkering with the Hammer Editor built into GMod, trying to make a map inspired by what i've seen in CSDesert_V2 and the recent Echo Maps, mainly to see if i could do it, but perhaps to try submitting to the GGMRP community to receive feedback to improve my creation, and if the Great Garnet wills it, maybe have it made an official map. But, in order for that to really work, i would need assets for MATCH, ATTC, textures to go along with it, and extras that Garnet/the community would like.
This, However, brings a different meaning to the "Community Built Map" the title suggests. It's not hard to make a basic or (even a more advanced) map, but when it comes to how it works, the players and the community need to have a say so it's fun for anyone and everyone.
Now, there are plenty of maps i've heard of but never played on, and so Aparh's suggestion would be nice, just to switch things up and keep things interesting.
Regardless of those points, i have to +1 this just because everyone wants more of a say in things, regardless of the situation. Yes, that is why we have the suggestions tab here in the forums, but people may not have "Valuable" suggestions, and need a prompt to work off of. I think that letting the community submit map designs to be voted on, or suggestions of things to be added to maps being created could really benefit GGMRP and its community by actually bringing people together to create something everyone enjoys