It looks like the hospice that cared for him will soon release a 2008 charity calendar featuring some of Peter Cushing's landscape art.
People who have contacted the hospice about it reported the following response:
Calendars are available next week from all three of our hospice sites. If you would like to ring 01233 504102 (Ashford Hospice) you can order by mail-order.
It does not appear that there will be an option for an online order. For those of you outside the UK, don't forget to dial the +44 country code before calling the number, i.e. +44-1233-504102. Not certain yet how much these go for and whether they can accept credit card payment or only £ cheques.