Most product can be engraved, personalized and logo’d in some way. Wooden bases can be personalized with engraved plaques.
Where there is space glass and metal can be engraved, all pens personalized.
Havens can design and print certificates which can be framed and then given as a further lasting seal of acknowledgement.
The costs to do this start at around £7.50 so it should not blow the budget.