Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Peg Mnemonic System

The peg mnemonic system uses paired associations, just like the link [ For more on 'link' go here: http://www.braingle.com/mind/89.html ] and loci [ For more on 'loci' go here: http://www.braingle.com/mind/110.html ] systems, with one advantage - you can recall the items in a non-sequential order.

To use the system, you will need to pre-memorize a set of concrete nouns that you will use to make your associations. These concrete nouns are chosen to correspond to the numbers in a list. This example list even has a nursery rhyme about it, "one two buckle my shoe, three four shut the door..."

One -- Bun
Two -- Shoe
Three -- Tree
Four -- Door
Five -- Hive
Six -- Sticks
Seven -- Heaven
Eight -- Gate
Nine -- Wine
Ten -- Hen

Once you have this list memorized (the rhymes with the numbers will make this much easier), you can use it to make visual association just as you do for the link [ For more on 'link' go here: http://www.braingle.com/mind/89.html ] or loci [ For more on 'loci' go here: http://www.braingle.com/mind/110.html ] systems. Now, if you need to recall the eighth item, simply recall the word for eight (gate) and recall what you have associated with that word. Peg words up to the number 20 can easily be made to remember longer lists.
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For more mind exercises: http://www.braingle.com/mind/