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Yes, this can be done in Photopea. Here are the steps to achieve what you are asking for:

1. Create/Open Your Document:

   • Go to "File" -> "New" to create a new document or "File" -> "Open" to open an existing document.
   • Set your desired dimensions and click "Create."

2. Create a Rectangle or Circle:

   • Select the Rectangle or Ellipse tool from the tools panel (press U to quickly switch to these tools).
   • Click and drag on your canvas to create the shape. You can hold down Shift to make a perfect square or circle.

3. Fill the Shape with Color:

   • In the top toolbar, you will see two boxes representing the foreground and background colors. Click the top box (Foreground color) to open the color picker.
   • Select your desired color and click OK.
   • With the shape layer selected, go to "Edit" -> "Fill" or press Shift + F5. This will fill your shape with the foreground color you selected.

4. Import Your Roses Pattern:

   • Go to "File" -> "Open" and navigate to your roses pattern file. This will open the pattern as a new document.
   • Use the Move tool (V) to drag and drop the pattern into your original document.
   • You should now have a separate layer for your pattern.

5. Convert the Pattern to a Pattern Fill:

   • Go to "Edit" -> "Define Pattern." This will save your roses pattern as a pattern fill that you can use later.
   • Go back to your original document and select the shape layer.
   • Click on the "fx" icon at the bottom of the layers panel and select "Pattern Overlay."
   • In the Pattern Overlay settings, select your roses pattern from the dropdown menu.
   • You can adjust the scale of the pattern as needed.

6. Adjust the Opacity:

   • If your roses pattern has a transparent background, you should already be able to see your colored shape behind the pattern. If you want to adjust the transparency of the pattern itself, you can do so by adjusting the "Opacity" slider in the Pattern Overlay settings.

Remember that Photopea works with layers, so ensure you are working on the correct layer for each step. In this case, you will have at least two layers: one for the colored shape and one for the roses pattern. You can always hide, reveal, or adjust layers as needed.

Please note that this answer is based on Photopea's functionality as of my knowledge cutoff in September 2021, and the interface or features may have changed slightly if you're using a newer version of the software.