Look at the various contests such as the #smlchallenge and #beatbattle and see if they fit for you. The themes can each round. Same with the other contests just click the name on the diagram above and it will take you to the most recent announcement.

Here is the most recent announcement post for the #smlchallenge :https://steemit.com/smlchallenge/@chiefmappster/steemit-music-league-challenge-s2-r8-announcement-or-a-dsound-community-initiative