What kind of bulbs? Different bulbs will have different harvest times and different recommendations for storage. In general, most tender bulbs prefer a cool, dark, dry environment and storage in a barely moist medium to prevent dessication. Slightly dampened peat moss or sawdust is often recommended, but I prefer wrapping cleaned, damp bulbs in newspaper. Just make sure they are not touching each other.

The bulbs are Mexican Shell Flower (Trigridia Pavonia), Gladiola, and Acidanthera.

Try the Bulb Forum.

This should be helpful:
http://www.extension.umn.edu/distribution/horticulture/DG1117.html

I'd use peat or sawdust for these smaller, corm-like bulbs. If you want to separate by color, use paperbags and label. Paperbags are porous enough to allow for proper air circulation but make sure they are stored in in a dry location, as they can also absorb moisture, as can the peat or sawdust. Moisture with these types of bulbs can promote rot.

What made you post this question on the landscape design forum?

KarinL