It's mah birfday

Mary will be turning one in just two months, and I've really got to get the ball rolling on her party planning. Any advice/ideas would be much appreciated. Here's what I have to work with:

• It will be winter...the average temp around that time is the mid-40s. Last year was a tad warmer; the year before we had snow.
• We have a small dining/living area.
• We have a decent-sized garage where I could hang some pretty tablecloths/sheets to hide all of Dick's shit. The garage is insulated, and it takes just one small heater to keep that place warm.
• Every kid invited (except 1) are 3+ years old.
• I would prefer not to have a cartoon-y theme but am open to a seasonal theme.
• There is always room for a pinata.

Please help!