Well this is mys way of doing bases quick and easy, it took about 1houer to do 35 bases.
-Gravel, sand and small basing slate (urban basing kit)
-medium basing slate (urban basing kit)
-Bits (raid your bit box for cool stuff)
-Net (I used a plastic musqito net)
-COD basing kit and urban basing kit can help you a long way but it can be replaced with bits.
More material can bee added and most of them replaced this is only the list I used.
First I took the bases and PVA glued the Urban basing rubbel and Cod basing rubbel (both can be replaced with bits) on the bases.
Then I took some wood filler and added some to the base
Then I took a tool and smoothen it out all over the base (do not cover details on the bitz you glued)
Next add some of the different materials by gently pushing them into the filler to make a more "sunken" effect and it makes the bases less clutterd and more realistic.
Repeat the process and be warned wood filler can be quite messy.
This is my results so far I will continue this tutorial as soon as possible I have to wait for the filler to dry. Hope it will be of some use for someone.