Ah yes, we often hear from people coming from AI finding it a difficult transition. It's probably bad enough that Inkscape doesn't have the same tools as AI, but the ones it shares usually work differently.
For gradients, I don't quite understand the problem you were having creating it. After we get the grapes sorted out, we could talk about that, if you want. Even though you created the gradient elsewhere, I still don't think you would have needed to make a pattern. But I haven't tested for sure.
To make a background object to hold the gradient:
-- select the grapes
-- duplicate
-- move to the side, if you think it would be less confusing, but not absolutely necessary
-- ungroup a few times, until it says "No more groups to ungroup" (3 to 5 times) (Object menu > Ungroup, or this button on the command bar
, or the key shortcut
-- Path menu > Union
-- Path menu > Break Apart
-- Path menu > Union
Don't deselect throughout those steps. Do them straight through.
The reason we have to do the Union twice is because of those 3 tiny highlight paths on 3 of the grapes. If you don't need those, it would be easy to select them before you start the process. Click on each one with the Node tool, do Ctrl A (select all - selects all the nodes), then Delete. Then you could skip the first Union.
If you moved the duplicate aside, you'll need to move it back over, and put behind the outline object. If you didn't move it, it's already in place. You just need to move it behind the outline. In case you haven't learned how yet, Object menu > Lower to the Bottom, or this button on the control bar
, or there's a key shortcut (Help menu > Key and Mouse Reference).
You'll probably see a sort of thick gray-looking horizontal line across one of the leaves. That's the edge of the pattern that you made with the gradient. (I'm not sure why it's thick and gray at the moment. Maybe something to do with importing it as EPS. Not sure.) If you notice 3 tiny handles - an X, a circle and a square, when you select it with the Node tool. Those are the handles for adjusting the pattern. The X handle moves the pattern around whole. So you can just move it to where the pattern borders are outside of the object. Just for future reference, the circle handle rotates the pattern (around the X handle) and the square handle adjusts the size (hold Ctrl key to keep proportions as you drag the square handle).
Let us know how it goes
Edit - You might want to group the border object and the background object, so that they always stay together. I'm not absolutely positive about this, but I think you should be able to apply the pattern to the group. That way, you won't have the difficultly of aligning the pattern of the outlines with the pattern of the background. It should make them automatically aligned.