Hi guys I would like to suggest you to colourise the radicals while writing the character in the scratchpad, I have been using Pingrid (an offline free opensource Skritter like for MS Windows) but I subscribed to Skritter because of the mnemonics and many good stuff that lack in Pingrid, but I am feeling like this is important, since I could recall a lot of radicals using color as mnemonic.
This technique is also used in Eon Estroke on Iphone.
http://ehaton.blogspot.com/search/label/Pingrid
http://www.eon.com.hk/estroke/