Ikea Lego looking boxes: re-purposed. To be honest, they were used. My mom is a school teacher and she used them in her 1st grade classroom for crayon boxes. She didn't need them anymore so I took them, cleaned them up (using W-40 to remove the crayon marks and dish soap) and they're as good as new. FREE.
Coloring Book: Free. This party here gave me a lot of inspiration and info. And I used this website to create a maze and a crossword puzzle. Just copied and pasted, cut to size, covered with spare scrapbook paper, and sewed together.
The pencil sharpener came from Zurchers (25 cents each), & the mini red pencils I purchased on eBay in bulk.
Lego kit. 30 cents each on Christmas clearance.
Lego Candy. Purchased at my local grocery store for $4.20/lb. I bought about 1 pound. They are so fun because they can actually be played with. Plus, it didn't hurt that they actually taste good (like sweet tarts).
Lego mini-fig crayons. I paid $9 for the mold (I found it on eBay in a set with a lego block mold). The crayons were gathered from our broken collection. Although these took a lot of time it was pleasurable recycling the broken crayons. But the kids had fun helping me make them and they are fun to color with! I won't repeat what others have already explained as far as instructions. If you'd like to make your own, there are some great instructions here.
Check out all the details of this party:
Inspiration Board: Pinterest
Part 2: Decorations
Part 3: Food
Part 4: Games
Part 5: Party Favors
Part 6: Photo Goods