DIY cat house made with crates. The link has a lot of other good DIY ideas.
Pet travel bag scarf sling carrier small dog tote by by HeartPup
K3517 | Kwik Sew Patterns - pet sling carrier
Small Dog Travel Bag
Reversible Sling Dog Carrier
Very simple bag pattern
Reversible bag pattern, I made this and it was very easy to sew. Easy sew bag
Small dog carrier. Made using Kwik Sew Pattern #K3517. Easy.