I would love to share one of my favourite pieces from a hallway collection, but I also adore the accent/feature wall idea and the image that Dytecture shared. I think a better light fitting is needed too, to make it lighter, brighter and more current. Do you have glass in your front door?

Pedestal with sculpture/vase and Painting the 23" wall that faces the front doors a different color, seem to be the winners :)

Could you put something in your loungeroom - something like a side table or hat stand - that creates a kind of vestibule? If you face the back of the lounge to the door, that can help create a separate space, too. (But you did say that you can't move your lounge) Please ignore this Christmas parts of photo!

Paving paint would be a cheaper option, Modwood is expensive but there is no maintenance, you could you use just ordinary timber decking for a timber look as well but it won't be as inexpensive as paint obviously. I think paint will look cheap. If it was me and I only had a choice between painting the tiles or leaving them as is, I'd leave them as is. I'd worry that it would scratch off the tiles especially on the ends. I used to have a garage painted in grey paving paint, it was very Matt looking, not shiny and the grey looked really grubby after a while. The tiles may not be your favourite part of the porch but make the decorating items the feature or save up and get them replaced with a grey tile you love. It's a small area so it shouldn't cost the earth. Do the removal yourself which would save you some money. It would really update the front of your house.