Glad you like them. A couple points which aren't mentioned in the tutorial:

1. Basically the easiest way to 'apply' a decal is to use Mixed Materials, but it only works from the top (Flat) or all sides (Automatic).

2. If you want to apply from the Front, Back, Left Side or Right Side, you'll need to use a Simple Material with layers and get the rotation angles from my website. There is also a PDF of the Mapping Notes as well.

3. The best way to accurately position and create different colored decals, all in one shot is to use a transparent PNG combined with a screen captured template-- which is detailed in the Advanced video. This is the only technique which uses both Alpha and Transparency functions. All the others use only the Alpha function.

HTH,
Chipp