I thought that probably not ALL the FF users know that this can be done and wanted to put this here as an example.
As you can make a selection on photoshop and then apply the filter effects to ONLY the inside of that selection, so WHY do not use this to fill the inside of any font that you may like with FF textures ?
For this you only have to type the text in Photoshop, and then make the selection of that text, so it encloses the content of the font you have choosen to use. Then you only have to activate FF plugin and choose the filter texture that you want.
The great difference than making this directly in Photoshop is that with Filter Forge you have many settings to modify and adjust the textures to fill the font in the best possible way and reduce or enlarge the texture as you want or move it or make it fit as you want and need, and you can´t do this with a simple bitmap texture that could be used a background in Photoshop.
Here I put some examples