Hexon 2 terrain custom rivers

Having ordered a load of hexon terrain from  kallistra , I decided to try and make some river tiles.
I checked my local diy store and found some expanded polystyrene underlay which was half as thick as the depth of a hexon tile.

and this is how they turned out after a dozen tries to find the right colour and tonnes of scenic water and future  floor polish...

2 mm  troops for scale