Here's a basic recipe. If you do a Google search for Cookies from Cake Mix you get a lot of links:
COOKIES FROM CAKE MIX
1 box cake mix (any flavor)
1 or 2 eggs
2 tbsp. shortening (or butter)
Water
Fruit, nuts, coconut, chocolate bits, etc. (optional)
Use 2 tablespoons water for crisp cookie or 1/4 cup for soft cookie.
Drop by spoonfuls. Or roll into balls and flatten. Or form into roll, chill and cut into slices. Use your imagination. Bake at 375 degrees for 8-10 minutes.
This is the recipe our family uses:
Swirled Chip Cookies
1 pkg. fudge marble cake mix
1/3 cup oil
1 egg
6 oz. choc. chips
water
Preheat oven to 350*. By hand, blend mix (do not add the little choc. packet yet), oil, 3 tbsp water and egg; mix well. Stir in chocolate chips. Transfer 1/4 (a little less) dough into a small bowl. Stir in 1 tbsp water and contents of small choc. packet. Spoon dark dough over light dough and swirl with a knife. Drop onto ungreased cookie sheet. Bake for 10-12 minutes. Cool 1 minute before removing from sheet.
These are THE ONLY chocolate chip cookies our family EVER makes!! Always turn out awesome!!! 
Ok, we were talking earlier about 'TopSecret Recipes' and this is mine! LOL
I made this one up one rainy afternoon when the kids wanted cookies and I was all out of margarine.... my neighbor asked me to make some for her to take to a Marine picnic and it won the $50 top award!
1 box Pillsbury Devil's Food Cake Mix
2 eggs
1/2 cup oil
@ 1/4 chocolate syrup
Add in: nuts, choc. chips, Andes mint pieces, Reeses chips...
Dump in a bowl and mix with a wooden spoon until it comes together - then I add the chips etc.....
Form into balls and bake at 350 for approx. 10 minutes - Makes 2 dozen
The ones I made for my friend had the Andes mints and if you are a chocolate mint lover, they are decadent! And from start to finish, this recipe take about 20 minutes - it is sooo easy. I don't make them often because I kept having to lie to the children and tell them the dog stole them off the counter...... it's true 
I would eat 9 or 10!
** edited to add this: forgot to say if you don't have any choc. syrup, just use about 1/8 - 1/4 c. water to moisten - I just like the extra 'fudgie-ness' 
and also forgot to say that if you mix 1 tsp. of flour with the add-in, it will stick better **
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