Terrain requirements

When building an item of terrain it must fit certain criteria.
1. It must be useable on the table. So, of a certain size if required by the rules set, in my case mainly DBA and Song of Blades and its derivatives.
2. It must be easy to make, as I am not very good at this.
3. It must be tough. Storage space is at a premium so terrain items tend to get thrown into a box at the end of a game. That means brittle, delicate, easily scraped or otherwise fragile items won't survive.
3. Be reasonably realistic looking. However the three points above are of greater importance than this.