Skype just released an update to their Android app, which will let you change the ringtones for individual callers. This is great if you're accustomed to having specific jingles for regular phone calls and want the same functionality available for those who contact you on Skype.
The update is still rolling out, but you can check that you're on the most recent version by heading to Settings > Applications (or Application Manager) > Skype and looking for version 5.10.x under the app name. To set up custom ringtones:
- Open one of your conversations in Skype and tap on the overflow menu in the lower right-hand corner.
- Select Ringtone options and then Set a custom ringtone.
- Pick from your currently installed ringtones and you will hear that play the next time this contact calls you.
As a bonus, Skype also added the ability to forward photos from one conversation to another. Press and hold on a photo and then choose Forward photo. You'll be able to pick who you want to send it to.