There will eventually be a comic book of housepets archives. IT IS INEVITABLE. Happens to all webcomics I've ever seen (the good ones that don't infinge on copywrite anyway) But the thing is, it usually has extra content in it, to make it worth buying just a little more. Now, I'd guess the book would go up to the style change. Recommended title: "Welcome to Babylon Gardens."

Necklaces/collars with the various tag styles would do well. Bonus if you can customize them.

T-shirts, coffee mugs: there's been many good suggestions in this thread already. But, I have two more...

Peanut and Grape riding on Pete

Zap! Peanut and Grape on the front, with Bino on the back.

T-****s? `U`.

But yeah, naw I don't like the idea of the first one, maybe more or so because of the fact it's like a minor thing that happened once with a minor character.

Maybe you could have print T-shirt with the house pets crew just doing crazy crap, or have a T-shirt with some Panels on it that is saying something amusing with the reference OF the T-shirt on it? It's generic but it sells.

Fixed that. Mistakes slip through the preview every once in a while. You coulda sent be a PM instead though. Now delete that quote!

I'd go for the collars

Okay I had an idea like this except it wasn't like real necklaces but like Grape or Peanut colored shirts with their respective charms hanging down from the collar of it.....

Now that, is a great idea.

I want a shirt with "At Least Poom Understands Me" on the front, then on the back the two panels of zooming onto Poom, and over the top it says, "Isn't that right?"

I'd wear that shirt.

ALL
THE
TIME.

For real.