This tutorial will guide you through a basic technique for creating the appearance of text that looks cut out from its background. Open a new image in Acorn, File ▸ New. Using the flood fill tool (K) in the tools palette, fill the layer with a color of your choice.
With your text layer selected in the layers list, go to Filter ▸ Stylize ▸ Inner Shadow. Click on the 'Shadow Color' color well to pick a different color from the colors palette. Play around with the offset, blur radius, and opacity values.