Shaikh Abdul-Muhsin al-‘Abbad hafidhuhallah was asked:
The ruling on sitting on the picture of the ka’bah which is on some prayer mats?
I do not know of any harm in that. However, these prayer mats that the people take should be free of pictures, whether a picture of a ka’bah or other than a ka’bah because it will disturb a person. However, if it is free of pictures and is one color and does not have more than one color, then this is more deserving for (being) a prayer mat.
[Sharh Ibn Majah no. 175]
Translated by brother Faisal