Cork is a great way to add some variety to your bases. There are a lot of tutorials on YouTube but here are a couple specific tips I've found useful:
Get a variety of thicknesses if you can. I use 2mm thickness sheets (from craft store) and 1cm thick "large coasters"(from Ikea?). This gives you a variety of heights and 1cm cork breaks into nice earthy shapes.
Try not to leave too much of the cork flat, nature is rarely flat. Break it up with your hands, rough it up with tweezers or cocktail sticks (think water erosion cracks), use mutlple layers (mini steppes), be random with your weathering.
I've used super glue or hot glue to affix it and, if you have larger/taller cork features, I like to cover the cork in watered down pva glue and let it dry before priming to give it some toughness.
Use one or more texture paints (Vallejo pumice, Stirland Battlemire, etc) to add some texture on and around the cork. Again, this makes it look less flat and provides some natural variation.
If you don't already, you may want to pin your minis to the base. A mini glued to cork only isn't as secure as if glued directly to the base.
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