Ever wanted a picture with rain on it? View this! When you have no name banner or picture you can view my name banner instructable: https://www.instructables.com/id/EBQN1Q5V4GEXCFM9WQ/
Step 1: Open Your Picture and Make Layers
Open your picture and the layer dialog by pressing Dialogs -> Layers.
Duplicate your picture 5-6 times (the more times the nicer rain)
After you duplicated the picture a few times make a white layer between each picture:
Step 2: Scatter & Blur
Now select a white layer and press Filters -> Noise -> Scatter HSV.
Mess with the value button until it looks like this: (120 is cool)
Now scatter all layers but the layers have to have a different scatter: like 120, 121, 122, 123 ........ or else the rain will not fall. Continue until you scattered all layers.
Next, select a layer and press Filters -> Blur -> Motion Blur and mess with the angle and length until it looks like rain: (make sure you selected the 'preview' box!)
Step 3: Color to Alpha and Merging
Now the effect: Select a rain layer and press Filters -> Colors -> Color to Alpha... and set the color to white. Repeat this with all rain layers.
Final: Select a rain layer, click the right mouse button and select Merge down. Now you see something like this:
To see the result, click Filters -> animation -> Playback.
Saving: Save it as a .gif file or else it won't rain and also press save anmation in the second save screen.