In my never ending quest to make Game Time Quicker to set up, I have my BIG HEX battleboards:
https://bg.battletech.com/forums/index.php?topic=59538.0But because I don't want every little terrain feature to be stagnant to the boards, I make all secondary scenery (trees, swamps, rough/rubble etc.) as add-on pieces I toss onto the board as needed.
Attached are some of the pieces, with the first being some 'crystal outcroppings'. These could be 'alternate' forest terrain (who says FOREST
has to be trees, on an alien world one could have crystal growths grant similar effects (lessened movement, blocks LoS, grants to hit penalties, etc), or conversely, maybe try and integrate the HBS effect of crystal fields.