PProtect
This tweak allow you to password protect your photostreams.
Navigate to settings, set up password and select, what photostreams you are want to hide.
Simple to use.
PProtect
$1.99
StatusModifier
Adds free RAM info and seconds to the clock in the status bar.

StatusModifier
Free
LockScreenCostomizer
Customize your lockscreen without respring.

LockScreenCustomizer
Free