Simple money spells can be the best if you don't have a lot of time or are fairly new to witchcraft. Don't be fooled that they are somehow less important because they are easy. For the most part, magick comes from inside you anyway. Even easy money spells can
First find some crisp, new, paper money, in the largest denomination possible. A twenty or fifty dollar bill is good, but if you do not have access to these sorts of sums try and use a set made up of one dollar, one five, one ten etc. Place these bills in a white envelope, and seal it. Fold the envelope towards you, and say once, every day, for seven days:
Powers that be, to me shall bring,
The means to double this sum.
Hear me, you spirits which sing,
Quickly, and gently come...
Hold the envelope up, and envision it becoming heavier. Keep the envelope in your bedroom between workings. After you receive more money, open the envelope and either spend, or deposit the money that was in the envelope.