It is permissible to prostrate on blankets etc.

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Check below answers in case you are looking for other related questions:
Is it prescribed to repeat al-Faatihah if a person did not focus properly when he recited it in prayer?
Sending Blessings on the Angels in the Prayer

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Related Answers:
It is makrooh to pray facing a person’s face
Reciting the opening takbeer quietly in a prayer in which Qur’aan is to be recited out loud
He sneezed whilst he was praying – should he say al-hamdu Lillaah?
Is it prescribed to repeat al-Faatihah if a person did not focus properly when he recited it in prayer?
Sending Blessings on the Angels in the Prayer

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