Wood tone kid's furniture would offer a nice relief from all the color and help balance the room. But that's not to say if you like a lot of color you couldn't paint the furniture to match.
As an example, to decorate with this kid room theme Dr Seuss paint the dresser white and paint each drawer front a different color using your wall colors. Then add contrasting knobs. Make your own custom knobs by gluing the Dr Seuss Wooden Hatch a Match Memory Game tiles (if you can find any) onto existing or new plain knobs. You might also try the magnetic letters or Cat in the Hat magnets, or drill through the Dr Seuss ABC Wooden Blocks
and screw them onto the drawers in place of the knobs.
Do the same type of paint treatment on the kids' beds. Paint the posts white, and any interior rails or panels alternating colors. Use the wall border or the wall stick-ups to trim your furniture.
The best place I've found for kid room theme Dr. Seuss and the Cat in the Hat items and collectibles besides Ebay, is Fun To Collect. They still have a pretty good selection.
Use the Cat in the Hat tissue paper to decoupage waste baskets, boxes or baskets that you have base coated white. You could even cut out the individual patterns to decoupage onto your drawer knobs for a kid room theme Dr seuss design.
The Cat in the Hat Wall Border Stick-Up and the Cat in the Hat Jumbo Wall Stick-Ups are vinyl self-stick, pre-cut, removable and reusable wall decorations. They're so quick, just peel and stick! Self-stick, removable, and reusable Stick-Ups are the easy way to decorate and won't harm walls . Decorate with the kid room theme Dr Seuss in minutes. I'm not sure where the orange in the wall border stick-up comes from, but another color to break the monotony is welcome. Maybe they will be adding in more orange kid room theme items later.
When purchasing items for the walls for this kid room theme Dr Seuss, keep in mind what color the wall will be behind them. For instance, the blue clock above would tend to get lost on a blue wall. The mirror would probably not look it's best on a red wall. That's why it's a good thing they have both these items in the 1 Fish 2 Fish theme.
And remember, everything doesn't have to match. Add in some solid color or plaid items to mix in with the Dr Seuss kid room theme items.