I would love to glean from everyone's wisdom here as well. Same thing: not too expensive and for gifting!
BTW, Misty I have 6 children (4boys&2girls) from 13 to 2 too! 
Have you done anything that all of your DC can work on together?
In the past, we made DH a painting for his office and each DC had a square. It was a great project we did for Father's Day last year. Not sure how I am going to top it! He LOVED it!!! And they had so much fun, put so much work into it, and it was a math lesson as well for some as we measured off the 6 equal squares but then saw our painting board was a rectange. How in the world? Then we talked about how 3 x 2 equals 6 ... anyway, it was FREE b/c we got the scrap wood from DH's scrap wood stash and paint from his paint stash.
We have also made ornaments several times from found objects.
Last year for Christmas, we made each family group (both sets of grandparents and our sisters' families) a "Shut the Box" game. That was a lot of fun and cost about $10 per game. We made one for ourselves as well and the children love to play it. It involved woodworking, painting, glueing the felt, and older DS laid out the instructions on the computer and younger ones worked on cutting them out and laminating.
This it the plan we used and other than the clasp (we didn't include one), this is how ours turned out! I wish I could top this too, but I don't think we can! All of our children were able to help in some way, which was great!
http://lowescreativeideas.com/idea-library/Shut_the_Box_1110.aspx
Thanks for starting this thread!