Sponging is probably easiest wall painting technique. Whit a little effort you can create great faux effect. Before you start sponging, you have to choose two colours, basic and additional (usually just a different shade of same colour). My advice is that you try to sponge on a piece of paperboard. You can use see sponges (be careful, see sponges can be expensive), but if you have limited budget use ordinary kitchen sponge (to create irregular surface rip and tear part of kitchen sponge) instead.