It can be a real challenge to build a decent first home with just the 16.5k alotted to a single sim at the beginning of a game, near impossible if you want to start on a "beautiful vista" lot. these lots start at around 6k. So how about seeing what people can produce with just 10k for a single newly created sim?
I would suggest parameters include: must be built on foundations, must have a seperate bedroom, and must have all essential furnishing basics with a modicum of comfort. (ie: a bed which is good enough to not give the "bad night's sleep" moodlet, a cooker which does not give "uneven cooking" and a fidge which does not give "tastes of fridge" to leftovers would be nice additional, optional parameters)
The house could be built on any small lot so that it can be moved to the users lot of choice.
Wow, you've just made me realise we haven't done many starter homes in the Contests, certainly not this year anyway!
I'd like to see some more community lot competitions. Particularly things like lounges, dive bars, dance clubs etc
Another idea could be for someone to create a shell (or take one from the shells thread) and for people to decorate it without changing the shape etc.
What about landscaping only competitions? House is already built and decorated, but the landscaping is a mess and needs redoing.
And finally what about some competitions on a specific theme? Eg: fairies, occults, celebrities etc
We'll most likely do more Dance Club venues as well as interior decorating. I like the Landscaping contest idea, that's quite clever and unique! The fairies and occults things will be around as well. We've got to try and leave a sufficient gap between similar contests though and since we just had the Storybook contest the fairies thing would be a bit in your face if we had one of those soon.
How about "The Perfect Workspace" where we have to design our idea of our perfect workplace based on TS3 careers. (non-rabbithole). I'll explain. Say I choose to design the ideal restaurant. I would design the whole thing, the only rabbitholes allowed could be Subways. If I design an office, it would be the entire thing, boardrooms, offices, breakrooms...
I think this would be merged with the idea Cndneh suggested on the Rabbit Hole builds as your idea would be the whole point of that but by putting the Rabbit Hole in the basement we get a fully functioning, good looking rabbit hole lot.
I'd love to do a beach resort, I'm itching to do one. It's really hot here at the moment so I'm in the mood for pools and cocktail bars!
Also how about a hospital? 
Sounds like you're in luck then? If you're in the mood for Pools and Cocktail Bars then I think you'll enjoy the
Summer Sunshine.
What about a Lunar Lakes community lots contest?
If we do that then it won't be for a while as Lunar Lakes is still Store Content whereas Barnacle Bay and Hidden Springs are now in Stores and like Stuff Packs. There will most likely be a Sci-Fi style contest in the future though.
I don't know if this has been said, but what about creating the various rabbit hole buildings as playable buildings. What would the Buisness Center really look like if you could open it up? what about the criminal warehouse, science center, police station, bistro, grocery store, even the cemetery? ("moveobjects on" could easily place the actual building in an underground location to make these buildings still rabbit holes and playable).
Now I've said all that I'm interested to create my own!
Funny you should mention that, I have my own list of ideas and that was one I put on it a few weeks ago after I was messing around making a Police Station - a modern build with the actual rabbit-hole in the basement. I also made a City Hall for Egypt when I was trying out the Nrass traveller Mod and tried doing that but the game crashed... Uhg or what? This is one of my current favourites, we've got the next few Long Contests booked up though - with one of my favourite ones to come...
