Why would "They" travell millions of Light Year Miles to come to this God forsaken planet and etch pictures in our dirt ?
Because they can...

..
just kidding... i don't think they have to travel to come here... i want to bet that... they can just teleport or shift... "travel" is primitive IMHO.. check out Michio Kaku's type of civilization... we're type 0 who consume thousand year old fossils for energy...
Are they trying to impress us with their picture abilitys ?
No... they just want to express... just like artists who wants to express their arts... this can include but not limited to hidden message... if you'll learn to appreciate it, you'll see..
Warn us ?
I don't think they "
want to" warn us... i think they are answering some of the request of certain group... some are just doing it because they choose to... warn implies fear of the unknown... if they do want to warn they'd do it long time ago... because they know what's happening, warning just doesn't make sense... i believe they are teaching us...
Some of these pictures have No meaning what so ever.
Yup no meaning for you...but it is meaningful to those who wants to believe it... it's like playing puzzle, it's fun....
It's just art work.
Agreed.. i like to see it that way...
Quote:
perhaps, we are them.....
And i agree with whymel.... some are indeed from ETs but most of it are from us.... the human collective consciousness...
A direct message will interfere with the timeline and free will... they can only guide but not direct us... imagine teaching a child to walk, the child can't just understand how to walk at the first time... they have to learn step by step experience all the mistakes first.... if we're not matured enough for contact, i'm pretty sure many people will want to rely on them or their technology without taking any effort or take them blindly as god... or even as enemy...