Or you can use security fittings to hang pictures, they are very cheap. and I mean very very inexpensive.
99.9% of your guests won't have the special tool to get the pictures unlocked from the wall. (My day job is picture framing, we do a lot for hotels)
Or for pennies simply screwing them to the walls with mirror plates is enough of a deterrent for the casual thief.
The problem you can have with Ikea frames is the thin plastic on the front, only 1mm thick on most which is prone to scratching when cleaning, and discolours rapidly under UV light, and often MDF backs which attract mould, many of the frames themselves are MDF with a paper wrap, so for many areas (eg coastal like ours) they can look good for a year or two, then you have mouldy walls and smells. But you get what you pay for.
Other big-box stores are available 😉
Calendar prints can be great, but calendars are not printed with light fast inks, which is made worse in ikea frames as there is little UV protection in the plastic "glazing" so they fade away. Great idea if you want to change out your pictures regularly though.
Regular 2mm float glass used as a baseline in the picture framing trade has 50 to 60 percent UV protection, low iron "super clear" glass has less, about 30%, other more expensive coated options have 98 to 99% UV protection.
Ikea frames are not too bad in the smaller sizes, but the mats are awful, and thin, and not conservation spec.
We supply Ikea head office in the Netherlands with mats for their office pictures by the way, so read into that what you will 😉