Colorizing
This is for Paint Shop Pro so if you have anything else, sorry. I used Paint Shop Pro 7 for this but I think it'll work for other versions.

1. Pick an image that you want to colorize. Here's mine:

2. Go to Colors -> Adjust -> Hue/Saturation/Lightness. A box will pop up that looks like this:

3. Make sure the box that says 'Colorize' is checked. Adjust the settings until you get the picture how you like it and click OK.

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