I had my older kids provide the hands and feet for handprints and footprints around the doors, window, and along the baseboard in red, blue, yellow, and green.  Then I spatter painted the doors of the changing table (actually an old microwave cart) and the fan blades to match the spatter print on the dresser we have.

I bought 4 cellulose sponges (fine texture, 99 cents) that would fit the hands & feet.  Then I put them in an old cardboard tray (Mac & cheese from Costco) with the plastic wrappers from the sponges in between.  I used plastic spoons to spread paint on the sponges and refilled as needed, usually about every three prints or so.  The kids just pressed on the sponge and pressed on the wall, no drips!  I did have a drop cloth on the carpet, of course!

Note that we did footprints above the baseboard.  It was much harder because the furniture kept being in the way of their big bodies (I'd move everything out next time) and because they had to scoot around on knees or rear ends.  I would hold the tray with the paint sponges for them to put both feet into, then hold them while we stamped together on the wall.  At the end, Dad came to take them to the tub to wash off and discovered how much they had grown!  Feet also tended to slip and smear more, but it still looks good.  I had to touch up a few prints with a sponge when they were too light or where baby brother touched a little too soon.
 
I would recommend that you make sure you can reach all the places you want to print before you put hands or feet in paint.  Some of the angles around the door in the corner were pretty difficult with just a step stool, and I would have needed the ladder if my kids had been any shorter.

For the spatter, I laid everything flat on newspaper and for each color I used a plastic disposable cup with a small hole poked in the bottom, then another whole cup to set it into to prevent leaks.  I had to thin the paint a little so it would drip, and sort of fling the cup to get the streak marks.  I didn't have to wait for each color to dry, either, because they didn't blend.  I only needed to rinse out the cups for each color and dry with a paper towel between colors (otherwise I got splatters of water along with the paint.)
 
With valance and bedding in matching colors, it finally looks better than the white on white we have lived with since we moved in four years ago. It only cost 4 quarts of paint since the white walls were still ok.

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