The first one (Cookie Monster) is made with the Cake Pop-Up die, but using only the bottom layer. Karen Burniston has a video showing how to make one of these. I googled "Cookie Monster Free Clip Art" and found several images. I used his face on the front, adding some googlie eyes for some whimsey. The sentiment was made with Word Set 2 - Birthday.
Following Karen's directions for the one-layer stage, I made the inside -- scattering some cookies around. I also used the Border Blends - Party, Numbers, and Word Set 8 - Congrats sets.
Here's a close-up of the main stage.
For the inside I used the Coffee Cup Pop-Up, cutting off the lid to make the garbage can.
Another piece of free clip art gave me this image of Oscar along with the garbage scattered on the ground. I added another border, using Border Blends - Argyle, at the top, and just the word Celebrate.
Here's a close-up of Oscar in his garbage can. The corrugated piece emulates the look of a real garbage can, don't you think?
The birthday party was this past weekend. I hope the "birthday boy" enjoyed these cards!