Coins across, Hanging coins, and just some general sleights work well. Love coin boxes too. Easy to carry. Tim Feher has some great stuff to use.

Extroydinary - (3 coin routine by Troy Hooser)is good for walkaround, as is
David Roth's coins across with [. This can be done without a table using the spectator's hand in lieu of one. In fact it's better when you use the spec's hand.

On Oct 24-25, in King of Prussia PA(Outside of Philadelphia), there will be a Coin Magic Seminar hosted by Roth, Rubinstein, and Gallo, with guests Eric DeCamps, Doug Brewer, and Scotty York. The theme will be WORKERS - practical and workable material for both the beginner and pro. Details at http://www.newyorkcoinmagic.net/coinseminar7.htm

I love coins as props.

Though I started with half dollars and Morgans, I also use smaller USA coins.

An example which I use often during walk arounds.

Take off my cap, while casually showing hand empty. (not look nothing here)

I reach into the cap and one at a time remove 3 silver coins...
pause and as a second thought reach in and produce 1 more ..this time a copper..

A few transitions and then they are individually thrown back into the hat..(actually c/p..)

Sometimes I use that as a walk off, sometimes I produce them from spectators elbows, ears...etc...

Sometimes I produce something bigger from the hat.