Does anyone know of a platform for creative people building ideas?

Foundler runs some pretty cool online hackathons. Haven't tried, but I'd think you might find some good people.

Slack has a ton of groups that are geared towards the goal of bringing together founders and creatives. Slack is just, awesome. (This group it seems has over 5,000 founders - https://www.producthunt.com/post...)

Various people come together and create the products and even make some revenues.