Was there a custom tower defense mode in WC3 Dota? It seems like it would work perfectly: have people pick 5 heroes, give them some amount of gold, send waves of ever more powerful creeps and they could upgrade their items in between rounds
There was so many types of games man. SO MANY. Every map had their own set of heroes and skills, I recall some about defending a base using heroes.
There was one where you used Space marines (from SC) and roam in a space station with aliens, the aliens could infest the marines and won when all of them got infested.
I really wish Valve opens up dota2 so we can get those maps again. Pudge wars was really fun for example.