One of the earlier game mats that I purchased was the Swamp mat from Deep Cut Studio.
The image below shows the mat in all its glory.
What is really interesting about the mat - artistically - is how the overall effect tends to blend in to the background, and yet the the level of detail in the mat itself is actually very high indeed.
If you click to open the image, and zoom in, you will be greeted by a huge and surprising level of detail that include individual tree roots that meander across the swamp's floor; foliage from individual trees; different colours of swamp foliage and plant life in the underlying background; several different species of plant life; and more besides.
The only thing missing is an over abundance of mosquitoes to be perfectly honest. But I will leave the flies to some Nurgle armies for the moment.
Overall, I am very impressed with this purchase. The mouse mat backing of the game mat means that it won't be slipping any time soon and the fall of die on the surface will not cause a huge clattering noise. The surface is wipe-able with a damp cloth, and anything spilt on it can be mopped up quickly with a minimum of fuss (well, maybe not red wine stains: I'm not at that level of consumer testing to be honest! ....Yet). A full 5 stars from me on this mat :)