We'll start with one of the most accurate renderings
Here's an iPad concept that Jesus Diaz at Gizmodo created based on various rumors and leaks at the time. It looks a lot like an oversized iPod Touch, but does resemble the modern iPad much more closely than other concepts we've seen.
'This is the real one, we can feel it'
Not so much. When this photo made its rounds thanks to French blog Nowheerelse.fr in 2009, it had many people, including the folks over at Engadget, convinced that this was indeed the real thing. We can't blame them for being intrigued— Nowhereelse.fr has a solid track record for picking up Apple scoops even today. The above leak was quickly proven inaccurate shortly after it was published.
Here's a really old one...
This ancient iPad mockup dates back to 2004 long before much of the gossip around Apple's tablet even started. Nearly everything about this concept, which was discovered in an old MacRumors forum post by The Next Web, is completely wrong. At least they got the name right.