What are your best house preparation tips for quick and cheap decorating, in preparation for a party?

We are having a surprise party for my mom in a little over two months. Party will be on the deck but of course everyone comes in the house anyway. I was planning on painting the dining room and kitchen (was planning that prior to party idea). I am going to put new throw rug in the bathroom, and I know that fresh flowers are always a good idea to freshen things up. I will of course make sure the house is clean and curtains and windows are clean.

My house is in pretty good shape. Does Fluther have any ideas for other house prep ideas, and quick and cheap decorating ideas, to prepare for a party?