Picos are HARD to scape! I made the mistake of buying a 3 pound rock as my first piece for my 2.5. It takes up about half the tank...so I had to work around it when scaping.
I think the best way to go about scaping a pico is to buy a whole bunch of really small, funky shaped pieces or large pieces of coral rubble, then glue them into shapes you like. I always like arches and cliffs. I think a good basis to work off of is start with two smals islands, slightly off centre one on either side. I like to put a pillar on the side with the shorter/smaller island.
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/-----\ ~~~0~~~~~
/...........\......0/----\....
imagine that is rock islands and a pillar...haha. I failed but u get the idea right? Work off of that with your other cool pices of rubble. Or do something totally different...whatever.
It all depends on the personality of your rocks. If youget traditional looking rock,it'll be boring, but with really quirky pieces, anything you do will look great! have fun!
I can't wait to see how this turns out!
oh yeah, just curious,what do you plan to stock this with?