You guessed right: you'll have to build it yourself.

Seen that your question is very general, this answer must be general as well.
- Try a modular approach, e.g. build 1 meter sections which you repeat. Group the lot together, then scale to exact width. Export & import to save your design for future projects.
- Search for a texture, e.g. "flynetting" or design something similar yourself. Make it into a transparent PNG (or GIF), which you apply to a wall or one side of a very thin cube (maybe make the opposite side invisible).

H