Stocks that express dsRNA or shRNA under UAS control for RNAi of non-Drosophila genes can be found here. See any of the main RNAi pages for information on the VALIUM vectors.
For information on use of EGFP lines for knocking down EGFP-containing proteins, see the iGFPi page. These lines express RNA for RNAi of EGFP and, for some, EGFP-derivatives. They are not effective against normal GFP or GFP derivatives.