Display collection

well basically it is your own thing how you want to present them - just go to the image editing program of your choice (paint *erhm), compose the parts you want, make a collage, potentially underlay a background image for the athmosphere, upload it to either legacy (as attachment when putting up the post) or to an image sharing site (imageshack or the likes) and embed the image into your post. Add a text or do not - it's all up to you.

For a post you can go to the section referenced by bsoltan and create a thread of your own or make a post in the beloved collections thread.

Not precisely sure which was the aspect that had you uncertain, so I covered everything I could think of that you meant.

Photoshop magic ✨