You could go to club websites and copy some pictures of youth players into a database. Then you can put real pics on the players faces. That's what I do with FM2007. It's probably possible with FM2008 as well.
You will have to do the following steps:
Create a directory with the name of your player.
Make sure the pic has the right resolution. In FM2007 pics had 95x95 resolution. I know it's a higher resolution now. You should look it up on the graphics forum.
save the pic as: name player.png (not .jpeg or anything else, it must be .png) For example "johnny speed.png"
Put the pic in the directory you've created.
Create a config.xml: you can use the default config-file located in data/graphics/pictures/players/normal/default (may be a diffferent location in FM2008). Open the config file with wordpad. There's a line that you can edit:
<record from="none" to="graphics/pictures/person/none/portrait"/>
You need to replace 'none' with the filename of the picture and the unique-id of the player. The line should look something like this:
<record from="johnny speed" to="graphics/pictures/person/2000146839/portrait"/>
Save as: config.xml
Put the file in the same folder as you picture. This file actually links the picture with the player.
How can you acquire the unique-id?
- preferences, enable unique-id, you should see a number under the name of the player.
- Do a search with genie scout (when it is released

)
Next step: put the directory you created somewhere in a file with other regen pictures: data/graphics/pictures/players/normal/...
Last step: preferences -> display & sound -> tick 'always reload skin on confirm' -> confirm -> the skin should reload and your pic should appear.