Most fun and profitable stay at home career?

I find painting to be very lucrative, especially if you have Nifty Knitting and can use Plopsy to sell the paintings. I had one Sim sell a painting for over 14K Simoleons which basically paid for her entire college education, no loans required. :) Combine it with the Painter Extraordinaire aspiration; with that aspiration's reward trait you can paint any of the emotional paintings regardless of mood, and also write all the emotional books (Romance, Workout Guide, Sad Book, etc.) and carve the emotional wood sculptures.