I need help in deciding something

Ya, i'm not a very creative person, so I need help in deciding something. I am making a TD and it is soo close to being done, but I don't like the way that you get extra gold after each level. Right now i have it like the zoator TD's (c my lack of creativity, BTW zoator TD has you fight creeps with heros to get extra gold). I really cannot think of any original ways to get extra gold after each level. I was thinking about making a horse race that you could bet on, but I don't know if that is good. If you guys can think of a good original way to do this, I would really appreciate you sharing that knowledge with me:ggani:

Triggers select a tower for each player at random. They enter that tower(FPS style) and have to destroy as many creeps as possible targetting only with the mouse in 1 minute. Each creep killed gets 10 gold, and the winning creeper gets 100 gold.

U can ever copy zoator TD with hero, do the race like in Pigfarm TD or do mini game like in Skibi TD. ( i think mini game is cool).

or U can make completly new things.
like a wheel of fortune to roll at each end of level...
and u can win some gold, lot of gold, a free tower, a free upgrade, loose gold, loose a tower, get some extra lives, get a malus( next level is hardcore level monster get 10% more hp or will be 20% faster), or you can jump one level (ex: from 10 to 12), or u can gain an item that your builder can use (like a spell charged item, a sellable item). if Team vs team td. you can make some player give gold to other player or give one tower etc..... you can almost do anything.

U can also make a playing race between player where instead of beting they can actually play (making it a mini game) the race is round u go accelaration zone (when u step on these zone your speed is 200% for 5 sec) danger zone (hiden mine that slow you with an ice attack or damage you) your car can die or be repaired the first three to finish will earn money.

U can make a quizz about the TD: what is the cost of the lava tower? what is the armor type of desertrider creep? when is the first flying level? how many hp has the second boss level? which one of these name is in the autor credits? etc...
each player got one question...3or more answer...if answered corectly give gold...if not give nothing.....

i can think of more but i think U allready have a lot to do with all these... good luck to u, i like a lot TD because it is a good start for noob mapmaker like me, but i must admit TD is more and more boring so good luck for your TD make it fun !!!
:ggani: