Now we can change apps' names as well as icons it makes a few things possible. Not just with Twitterrific

(download)

Click here to download:

custom-ios-5-push-alerts-BhCnIlCotdmAiIFAseEo.zip (2.2 MB)

Here's how it's done:

I used 4 different push apps. Boxcar, Push 4.0, Howl and Prowl.

Twitterrific
I grabbed the icons from Twitterrific by using PhoneView (can also use iExplorer). The resources are located in Twitterrific > Twitterrific.app. 

I renamed them to match the names of the app icons in Boxcar. Then I copied the Info.plist file from Boxcar to the Desktop. I opened up the plist file and changed the Bundle display name from Boxcar to Twitterrific (after a tip from Klein Maetschke). Then copied the edited plist file and Twitterrific icons to Boxcar. Boxcar already has Twitterrific's notification sound but if you prefer to use a different push app you can grab the sound from Twitterrific, rename it to match 1 of the other app's sounds and then replace the old sound with the new 1.

After changing resources in an app you need to change the phone's language (Settings > General > International) to a different language in order to respring the Home Screen and clear the cache (rebooting the phone doesn't make the changes take effect). Keep changing the language until the changes take effect. Once you've done this go back to Settings > General > Keyboard > International Keyboards and remove any of the foreign keyboards that have been added. Thanks to Tom Klaver for the tip.

Transmission
I used Prowl for Transmission, changing the name and icons like I did with Boxcar/Twitterrific.

On the Mac running Transmission I used Prowl's Growl desktop plugin to send push alerts. I didn't like the standard Transmission Growl message as it said "Transmission" twice, so I turned off normal Transmission Growl alerts in Growl's preference pane and made Transmission run an AppleScript once downloads had finished (Preferences > Transfers > Management > Call script when download completes).

iOS Alerts
I just changed the name of Push 4.0 app with the same method as above and use it for RSS alerts and a Twitter list.

Growl
I used Howl for some Growl alerts (other than Transmission) sent from my Mac mini (when Handbrake conversions have finished,  when Speed Download finishes downloading, when someone adds a file to a shared Dropbox folder etc.) Like Prowl is has a Growl desktop plugin (so does Boxcar). In Growl's preferences you can setup individual alerts for specific notifications, so don't have to have every Growl notification for apps your using pushing alerts to your iPhone or iPad.

Here are some of the icons I used http://cl.ly/ATJE
If you use the icons in different apps to the ones I used make sure the names match the app icons they're replacing.