Everyone has their own style, so I'm going to bet you'll get 20 different answers here.
I like to use most of the grass, flower, small stone/green bits for my detailing. I'll then fill sections up with the cut swamp tiles. I'll shove in clumps of bushes too. I don't do the half bush/half stem thing like you can see in my example anymore.
I also like to use the holes made by signs. Over lapping grass is also another thing I like to do.
My detailing example:
http://forums.graalonline.com/forums...chmentid=25938