grab bag

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A container filled with articles, such as party gifts, to be drawn unseen.
• noun Slang A miscellaneous collection.

from The Century Dictionary.

• noun A bag containing articles to be obtained by thrusting the hand within and seizing one, the privilege of doing so being previously bought, a common money-getting device at charitable fairs; figuratively, any unscrupulous device for gain or spoils, into which the element of uncertainty enters.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a gift, purchase, etc. whose contents are concealed until after a selection is made
• noun idiomatic any random assortment, selection or possibility

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a container from which a person draws a wrapped item at random without knowing the contents
• noun an assortment of miscellaneous items