You need what items again and what do you do with them? I might get a nostalgic pet if I can afford it. Thanks for the reminder. I'm thinking a paralix right now.

From the FAQ:

Nostalgic: You can transform an existing pet into a Nostalgic pet at Vanya's Workshop in the Arctic Frost.

1. You will first need to obtain a Nostalgic Instructions kit for the nostalgic pet you want to make (i.e., Nostalgic Kumos Instructions, Nostalgic Manchu Instructions, etc.), and an Essence Of Melody. The kits are sold in the Thimble & Co. shop, and the Essence Of Melody is sold in the Millionaire Center. They may also be found in user shops.

2. With the Nostalgic Instructions kit in your inventory go to Vanya's Workshop, and he will then send you on a quest to bring him three items. The items asked for will include two random items from the Thimble & Co. shop, and either a Plushie Makers Kit, Plastic Molders Kit, or Wood Carvers Kit. These kits can be purchased from the Thimble & Co. shop, the Crystal Shop, and user shops. Be aware that one of the quest items could possibly be another Nostalgic Instruction kit. This is not an error since they also sell in the Thimble & Co. shop. NOTE: If you start a Vanya's Quest and decide for whatever reason to quit the quest, you will NOT get your Nostalgic Instructions back. This is not a glitch so do not submit a ticket to ask for it back if you quit the quest.

3. Once you have the items Vanya asked for, go back to Vanya's Quests and in exchange for these items he will give you a nostalgic toy that corresponds with the Nostalgic Instruction kit you initially gave him (i.e., Nostalgic Kumos Toy, Nostalgic Manchu Toy, etc.)

4. With the nostalgic toy he gave you and an Essence Of Melody in your inventory, return to Vanya again and he will change your pet to Nostalgic. NOTE: The workshop is set by default to change your ACTIVE pet, so make sure that you have the pet you are wanting changed selected as your active pet!

Alternatively, you can bypass the quest by purchasing the nostalgic toy that corresponds with the nostalgic pet you want. Then with the toy and the Essence Of Melody in your inventory go to Vanya's Workshop and he will transform your active pet into a nostalgic pet.

So you will either need the instructions or the toy for the Paralix if that's the one you want to make. You'll need an Essence of Melody either way, but you can check the prices of the toy vs the ingredients you might need to make that one and see which option would be cheaper.

You need an Essence of Melody and a Nostalgic Paralix Toy, then take them to Vanya's Workshop to change your active pet into a Nostalgic Paralix.

You can make the toy by giving Vanya a Wood Carvers Kit and Nostalgic Paralix Instructions.

thank you so much!

No problem!

In this case, it looks like it would be cheaper to buy the kits and make the toy yourself, if the Paralix is what you want.

thankies