Every album in Picasa Web Albums is potentially collaborative. This means you can open up your online albums so other people can contribute photos. Make an album collaborative by adding contributors -- just click the Share button in Picasa Web Albums, add contributors, and select the box next to "Let people I share with contribute photos."
Contributors will need to sign in to their Google Account to add photos. Their content will be attributed to them, and they can make edits such as adding captions to, rotating, or even deleting the pictures that they've uploaded. Of course, as the owner of the album, you have the ability to edit this content as if it were your own.
You can manage collaborative access for contributors on the "Shared with" list by toggling the 
icon next to their name. A green icon means that user or group of users can contribute.
- All contributions count towards the Picasa Web Albums storage quota of the album owner.
- You're responsible for all content uploaded to your account. If photos in your account are found to violate our Program Policies, as the album owner you will face the consequences.