General synonyms:
* Assortment
* Compilation
* Anthology
* Potpourri
* Medley
* Hodgepodge
* Grab bag
* Assortment
* Collection (this one is quite broad but can work depending on the context)
More specific synonyms:
* Treasury (implies a valuable or important collection)
* Panorama (suggests a wide-ranging collection)
* Spectrum (emphasizes the variety of the collection)
* Kaleidoscope (implies a collection that is visually diverse and fascinating)
The best synonym for you will depend on the context in which you're using the phrase.