Your exact object
The colours, the case, the shape. The giant version is built from your own photo of it.
Image trend
Upload a photo of you and a photo of the object you want giant. You get a street snapshot where you hold it, enormous, and it still looks like a real photo.

Hold your phone, your ice-cream, your coffee. Absurdly huge. Add a clear photo for each of the 2 slots; the look is already set.
A clear photo of you with your upper body visible.
A photo of the thing you want giant: your phone, an ice-cream, a coffee cup, sneakers.
Upload a clear photo of yourself, upper body in frame.
Upload the thing you want blown up to giant size.
About a minute later you have a street photo of you holding it.
Save the image and share it anywhere.
The colours, the case, the shape. The giant version is built from your own photo of it.
Daylight, a real street and believable shadows, so the scale gag lands instead of looking cut and pasted.
Your face, hair and outfit carry over from your photo.
Two: one photo of you and one photo of the object you want giant. Both are needed.
Your photos are used to make your image. Only upload photos of yourself, or of people who have agreed to it.
Check your plan's terms for what you can do with generated images. They apply to your result.
About a minute. You can leave the page; the finished Big Thing Effect image is saved to your assets.
Anything with a clear shape: phones, ice-cream cones, cups, sneakers, bags. Simple, well-lit photos give the cleanest result.
One selfie, one object, about a minute. Then watch your friends ask how you did it.