Great tip, Gina!!
Amy - using Gina's idea, below is a quick sample where the text is Arial black and has been reinserted on the slide as a PNG instead of a textbox (to do this, you can right click the textbox and choose Save As Picture, and use the png format ... then use Insert > Picture to insert the png onto your slide).
Once the text is inserted as a png, you can go to the Format tab, choose Artistic Effects, and click Artistic Effects Options, which brings up a window where you can select and fine-tune your options. I used the artistic effect called Pencil Sketch, and chose 10% transparency and a pressure of 1.