For this tutorial, you will need two tubes, one of which needs to be a rose.
1 Open the rose tube.
Resize it to 300 pixels high.
Layer New raster.
With the flood fill tool, fill with a nice dark red.
Move this layer under the other.
Layers Merge all.
Effects Image effects Seamless tiling.
This tile will become the background pattern, scale of 25%.
2 Open a new image 550 x 550.
With the flood fill tool, fill with a linear gradient with two tones of red 45° angle, 5 repeats.
3 Adjust Blur Gaussian blur : 20.
4 Pick the preset shape tool, select the Square Shaded shape.
The rose tube as the background tile, and a dark red as foreground, set a value of 4 for thickness.